The basic photometry quantities of a dual-panel backlight are investigated from an energy flow viewpoint. A Gaussian-like distribution of the main panel and subpanel luminances is assumed and the luminous flux, illuminance, and luminance of the two panels are solved analytically. The influence of the luminance cone angle on the photometry quantities of the main panel and the subpanel is carefully examined. Finally, an assessment of the attainability of either equal or nonequal luminance conditions of the main panel and the subpanel is presented. The results show that the upward luminance cone angles of the subpanel region and the main panel area minus the subpanel region play an important role in determining the luminous flux and illuminance in these regions. The luminance cone angles of the upward and downward directed fluxes govern the luminance difference between the main panel and the subpanel. Finally, the relationship between the luminous flux ratio and the subpanel luminance cone angle ratio suggests that a maximum luminance difference of 70% can be obtained between the main panel and the subpanel when the dual-panel backlight is designed with a symmetrical layout about the light guide. © 2006 Society of Photo-Optical Instrumentation Engineers.

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The principle and structure of linear rectangular prismatic scanner are analysed. The linear scanning shiFt nathematic model of the scanner is derived in this paper. By analysing, showed that if the parameters of tlie scanner are selected correctly. the maximum linear scanning deviation can be controlled in a small interval. The angkllarity measurement accuracy of large axle can reach subinicrorneter level.

This paper derives the light amplitude distribution expression of a laser resonator. Using a numerical analysis, the result shows that the laser output power is maximum when no dynamic aberrations are in the laser cavity. The power and mode distribution of the laser are obtained. The paper presents an adaptive correction theory of laser resonator phase aberrations by using a 3D model deformable mirror. The result ofthe computer simulation in the close ioop system shows that the system can compensate the dynamic phase aberrations up to 90% for the phase disturbance within 0-10 Hz frequency range.KEY WORDS: adaptive optics, laser resonator, dynamic phase aberration, model deformable mirror.